Phantom of the Ritz (1988)

Ed Blake is a balding middle-aged man who decides to buy an old movie theater, The Ritz, to shape it up into a retro 1950s music hangout. With the aid of loyal girlfriend Nancy, foreman Bruno, and assistant Marcus, Ed is able to assemble a construction team to plan to be on time for the grand reopening. But unknown to everyone, a disfigured character has lived in the passageways of the old theater since the 50s, occasionally popping out to murder an indigent or intruder that happens upon his domain.

Unfortunately the movie Phantom of the Ritz is not yet available on HBO Max.